As a fan of gadget blogs such as Gizmodo and Engadget, Tom Whitwell started Music Thing in 2004 after realising that there were no similar blogs for music gear. The blog showcases unique and strange instruments, and traffic grew as gadget sites began to link to Music Thing. Now, the site receives tens of thousands of visitors each day.

In July 2007, Tom wrote an article for The Times discussing his passion for his blog's content, despite the low AdSense revenue he had earned since joining the program in August 2004. His friend James noticed the article and encouraged Tom to make a few changes to improve his earnings. According to Tom, "this was the incentive to tidy up my template a bit, and think more about ad placement."

Tom started by moving the ad unit on his homepage above the fold and opting into image ads, to ensure that all available ads would compete against one another. On his article pages, Tom added link units at the top of each page and placed a medium rectangle below each article. In addition, he removed the borders from his ads and adapted the colours to blend better with the site.

Using custom channels, Tom was able to compare the effectiveness of his ad units on his article pages. Tom notes that "the block I'd considered my main ad (the skyscraper on the right) was much less effective than I'd thought. As Google suggested, the medium rectangle that I placed beneath each article is the biggest earner." Tom also found that small changes could go a long way -- he made a few template changes to ensure that the highest performing ad unit appeared first in the HTML code, which helped increase his earnings.

"It took me a few hours to optimise the site, after reading a few blogs about AdSense, looking at the advice from Google and my friend, and trying a few template changes," Tom says. "The results were amazing - with no extra traffic to the site, my average daily earnings have increased by over 500%." Although Tom doesn't plan to quit his day job any time soon, he notes that "every little bit helps."

After this experience, Tom recommends that other publishers "follow the optimisation suggestions as long as they leave you with a site you're happy with. If you lose confidence in your own site, you'll irritate your audience and lose interest in what you're doing. But at the same time, make sure you watch your statistics, so you know what works and what doesn't."